Sanding block



FIG. 1 sets forth a perspective view of a sanding block showing the new design;

FIG. 2 is a front view thereof, the rear view being identical thereto;

FIG. 3 is a top view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a right side view thereof. 

The ornamental design for a sanding block, as shown and described. 